Owners manual

4”Z1W/S CORE DRILL
14
Troubleshooting
Note
SERVICING SHOULD ONLY BE DONE BY A QUALIFIED TECHNICIAN.
DON’T FORGET TO UNPLUG POWER TO UNIT PRIOR TO SERVICE!
PROBLEM
SOLUTION
Motor does not
turn on.
1) Check external power source (extension cord, breaker, etc).
2) Loose internal wire. Check and secure if necessary.
3) Motor brushes defective. Replace if necessary.
4) Check to ensure the motor on/off switch is operable. Replace if
necessary.
Excessive
sparking when
motor is running.
1) This may indicate the presence of debris in the motor or worn out carbon
brushes. Check the brushes for unusual wear and replace if necessary.
Clean out the internal motor armature if necessary.
2) Armature has a rough edge. Inspect and replace if necessary.
Hole is not
cutting.
1) Cutting bit is dull. Replace bit.
2) Work area material is not appropriate for bit type.
Bit is jammed
while coring.
1) Debris is lodged between core hole and bit. Rotate bit in both directions
to and inspect bit for debris.
2) If using the drilling rig, make sure the base is secured to the work surface.
Coring speed has
reduced.
1) Bit has hit rebar. Adjust feed pressure to prevent motor overload while
cutting through rebar.
2) Diamonds on bit have glazed over. Deglaze bit or dress diamond rim on
bit and check water flow rate.
3) Diamonds on bit have worn away. Replace core bit.
4) New core bit. Core at slow rate with new bits for 2-3 coring cycles.
5) The safety clutch is slipping. Tighten clutch.
6) Drilling progress is prevented by an accumulation of dust. Use suitable
vacuum cleaner.
7) Water flow rate is too low. Increase water flow.
8) Core is stuck in the core bit. Remove core.
Core bit appears
to wobble.
1) Spindle is damaged. Replace spindle and check bearings.
2) Bit is bent or damaged. Replace bit.
3) The core bit is not screwed securely onto the spindle.
4) Coring material is attaching to the bit. Inspect bit and increase water flow
rate.
Water escapes at
the water swivel
or gear housing.
1) The water pressure is too high. Turn down water flow.
2) The shaft seal is defective. Replace seal
3) The water hose is damaged. Replace hose.
Chapter
4